Sally Bercow said her husband “wasn’t very pleased” that she was joining the new-look reality show.
Mrs Bercow said she was taking part to “stick two fingers up to the Establishment” but also to raise £100,000 for the charity Ambitious About Autism.
In the film shown before her arrival at the house in Elstree, Hertfordshire, she said her husband tried to keep her in line, but added: “The very fact I’m on here proves he hasn’t succeeded.
“I hope he doesn’t divorce me over it.”
Mrs Bercow said she wanted to prove she was a person in her own right, adding: “I am not my husband.”
“I want to stick two fingers up to the Establishment, who think it’s not the sort of thing I should do,” she said, and admitted “it’s going to raise a few eyebrows in Parliament”.
When she arrived outside the house, wearing a tight blue dress and black heels, presenter Brian Dowling asked how her husband felt about her decision to appear.
“He’s not exactly chuffed about it,” she said.
“He wasn’t very pleased, but he does know what I’m like.
“He respects the fact that I do my own thing.”
Others in the house with Mrs Bercow include Kerry Katona, American Pie actress Tara Reid and Amy Childs, from ITV2’s The Only Way Is Essex.